Peat-drying apparatus.



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PBAT DRYING APPARATUS.

APPLICATION FILED APR. 7, 1911.

1,036,072. Patented Aug. 2o, 1912.

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A. S. CAIRNGROSS. FEAT DRYING APPARATUS. APPLICATION FILED APR. 7, 1911.

1,036,072. PatentedAug,20,1912.

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ANDREW S. CAIRNCROSS, OF ST. PAUL, MINNESOTA, ASSIGNOB. El() SHERMAN T.

WOLFE, 0F ST. PAUL, MINNESOTA.

raar-Davinci.' APPARATUS.

Specification of Letters Eatent. Patened?, Aug, 209 1912,

Application led .april 7, 1911. Serial No. 6158.520.

To all lwhom t muy concern:

Be it known that l, ANDREW S. Canincnoss, a citizen of t-he UnitedStates, residing atl St. Paul, in the county of Ramsey and State ofMinnesota, have invented certain new and useful Improvements in- Peat-Drying Apparatus, of which the following is a specification.

My invention relates to improvements in drying apparatus `designedparticularly for drying peat, and consists in the features of'construction and combination hereinafter described and claimed. -v

In the accompanying drawings forming part of this specification Figure 1is a longitudinal vertical section of my improved 111- vention partlybroken away; Fig. 2 is I'a similar viewl of the outlet end of theapparatus; Fig. 3 is a top View of the feed chamber of the apparatus;Fig. 4 is a perspective view of the beatinof mechanism arranged inside Ythe feed cham ier, partly broken away; Fig. 5 is a section on line .1iwIof Fig. 1; Fig. 6 is a section on line y--g/ of Fig. 1; Fig. 7 is alongitudinal section of a portion of steaml pipe forming part of myinvention; Fig. 8l

is a perspective view, broken away, ofthe outlet conveyer of myinvention; and Fig. 9 is a pers ective' view, broken away, of the outleten of the drying chamber.

Referring to the drawings A represents a vertical feed chamber.Vertically disposed within the feed chamber is a sli-aft 2 journaled a'tits upper end in skeleton framework 3 aeross'the top of the hopper, andat its lower end in the frame-work 4 supported above the boiler 5. Theshaft 2 carries a plurality of beater arms 6, which extend Ioutwardly`between the intermeshing arms 7 projected inwardly from the side wall ofthe feed chamber. The arms .6 and 7 are referably o positely inclined asshown `1n Fig. 4 in or er better to treat the materia-l asJ it passesthrough the chamber. A tube 8 leads from the lower end of a dryingchamber 9. Within the tube or conduit 8 is journaled a screw conveyer10, which carriesat its feed chamber end a plurality of beater.

arms 11. The conveyer shaft at the outlet end of the conduit alsocarries a plurality of beater arms 12 which work between inwardlyextending arms 13 carried by the wall of the tube. v The dryingchamber`9 is rotatable within the inclosing casing 14 and rests upon theanti-friction rollers 15.

l'Vithin the drying chamber is ay spiral steam pipe 16v connected withthe boiler outside the inlet end of the drying chamber by means of apipe 17. The opposite end of the steam coil 16 is connected with adischarge pipe 17a which may lead back to the boiler, as indicated inFig. 1. Carried within the drying chamber by the steam coil are aplurality ofV blades 18 which serve to throw the peat. away from thesides of the chambei' toward the center thereof and feed the saineforward as the chamber and vcoil revolves. vThe dischargeend of thedrying chamber opens into ay hopper 19 from which leads the discharge.conduit 20. The discharge conduit 20 contains a screw conveyer y21, theshaft of which sup orts at the outer end of the conduit a plurality ofbeater arms 22 which -work between inwardly extending arms 23 carried bythe conduit.

Aisshown in Fig. 1, the combustion chamber of the boiler furnace leadsint-o the casing 14.J underneath the drying chamber, whereby theproducts of combustionv vpass under the drying cham-ber and into theopen discharge end thereof, whence they pass through the drying chamberand outward through the discharge pipe 24 to assist drying the material.

The different operative parts are operated as follovis: Su ported uponthe outer end of the shaft o ythe screw conveyer 10 is a drive pulley 25adapted to be driven from a suitablel source of power. rlhe shaft of thescrew conveyor 10 outside of said drive pulley has bevel gear and shaftconnection 26 with the lower end lof the shaft 2 journaled within thefeed chamber. Centrally mounted upon the outer end of the supporting,shaftv of the screw conveyer 21 is a pulley 27 adapted to be driven froma suitable source of power. The shaft of the screw' .conveyor 21 carriesat its inner end a pinion 28 intermeshing with the pinion 29, which inturn meshes with a toothed ring 30 surrounding the dryin chamber;whereby the drying chamber wil be rotated as the screw conveyor 21 isrotated. In Fig. 7 is shown the connection between the steam pipe 17 andthe spiral steam coil pi 16. It will be seen that the pipe 17 exten sinto the end of the pipe 16, and a steam tight joint is formed by meanslof the gland 31 and sleeve 32.-? A

When the actuating parts are in operation the material to be dried isfed into the top of the feed chamber A, and in passing through thischamber is beaten up or macerated by the coperating beater -arms 6 and7. From the feed chamber the peat is carried by the screw conveyer 1 0to the drying chamber, and in its passage is further beaten up in theconveyer by means of the beater arms 11 and the coperating beater arms12 and 13. The material is conveyed through the drying chamber by meansof the steam coil 16 and the blades 18 coperating with the rotatabledrying chamber, and in its passage is thoroughly dried by means of thesteam heated coil 16, and the hot products ofcombustion passing from theboiler furnace through the drying chamber. From the drying chamber thematerial passes into the hopper 19, to the discharge pipe 20 throughwhich it is carried by means of the screw conveyer 21, working therein.In passing through the 'pipe 20 the dried material is further beaten upby the coperating beater arms 22 and 23. f'

I claim as my invention:

1. A drying apparatus of the class described, comprising a feed chamber,bcating apparatus arranged within said feed chamber, means for actuatingsaid beating apparatus, a boiler and furnace, a rotatably supporteddrying chamber connected with the chamber of said furnace, a screwconveyer connecting said feed chamber and drying chamber, a steam coilwithin said drying chamber, a connection between said steam coil andboiler, and conveyer blades supported by said steam coil.

2. A drying ,apparatus of the class described, comprising a feedchamber, beating apparatus arranged Within said feed chamber, means foractuating said beating apparatus, a boiler and furnace, a rotatably suported drying chamber connected with t e combustion chamber of saidfurnace, a screw conveyer connecting said feed chamber and dryingchamber, a steam coil within said drying chamber, a connection betweensaid steam coil and boiler, conveyer blades supported by said steamcoil, and a discharge screw conveyer arranged in connecaround theinterior wall of said dryingk chamber, and means for rotatingsaid coiland chamber.

4. A drying apparatus of .the class described comprising a dryingchamber, a spiral steam coil arranged around the interior wall of saidchamber, means for feeding material to be dried to said chamber, meansfor beating up said material, and means for rot-ating said chamber andcoil.

5. In drying-'apparatus of the class described comprising a dryingchamber. a boiler and furnace, the combustion chamber of said furnaceopening into one end of said drying chamber, a steam coil within saiddrying chamber, a connection between said steam coil and boiler, andmeans for rotating said steam coil and chamber.

(3. A drying apparatus of theclass described comprising a dryingchamber, means for feeding the material to be dried thereto, a steamcoil extending spirally around the interior of said chamber and meansfor rotating said coil and chamber.

7.,A drying'apparatus of the class described comprising'tan outerchamber,a drying chamber rotatably supported within vsaid outer chamber,meansfor feeding material to said drying chamber, heating means arrangedin coperation'with said feeding means, a boiler and furnace, thecombustion chamber of said furnace being connected through said outerchamber with the interior of said drying chamber, a steam coil arrangedWithinsaid drying chamber and connected with said boiler and discharge`ilpechanism leading from said outer chamef. A

In testimony whereof I affix my signature in presence of two witnesses.i

ANDREW S. CAIRNCROSS. lVitnesses H. SMITH', ARTHUR P.l LoTHnoP.

